Removed value from warning about skipping flags (#4491)

* Enabled skipping of unkown flags from config in parser
* Added new unit test, expanded existing
* Add warning back in, without value

Signed-off-by: Derek Nola <derek.nola@suse.com>

pkg/configfilearg/parser.go

@@ -90,7 +90,7 @@ func (p *Parser) stripInvalidFlags(command string, args []string) ([]string, err
 		if validFlags[mArg] {
 			result = append(result, arg)
 		} else {
-			logrus.Warnf("Unknown flag %s found in config.yaml, skipping\n", arg)
+			logrus.Warnf("Unknown flag %s found in config.yaml, skipping\n", strings.Split(arg, "=")[0])
 		}
 	}
 	return result, nil